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Home >> Ford >> 2021 >> F-150 Raptor >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Pinpoint Tests (Diesel) >> Pinpoint Tests MD: Fuel Pressure Sensor And Fuel Delivery Pressure Switch >> Test Procedure

Test Procedure

  1. MD1 CHECK FOR DTCS 

    Are DTCs P008A, P01C4, P01C5 or P01C6 present? 

    Yes No
    GO to  MD2. RETURN to SYMPTOM CHARTS for further direction.
  2. MD2 CHECK THE VREF AND SIGRTN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • For Transit Connect,
    • Fuel Pressure And Temperature Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-) Fuel Pressure And Temperature Sensor Connector, Harness Side
      VREF SIGRTN
    • For all others,
    • Fuel Pressure And Temperature Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
    (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-) Fuel Pressure And Temperature Sensor Connector, Harness Side
    VREF SIGRTN

    Is the voltage between 4.5 - 5.5 V? 

    Yes No
    GO to  MD3. GO to PINPOINT TEST B .
  3. MD3 CHECK THE FLP CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • PCM-E connector disconnected.
    • For Transit Connect,
    • Measure the resistance between:
      (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-) PCM-E Connector, Harness Side
      FLPT FLPT
    • For all others,
    • Measure the resistance between:
    (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-) PCM-E Connector, Harness Side
    FLP FLP

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  MD4. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  4. MD4 CHECK THE FLP CIRCUIT FOR A SHORT TO GROUND OR SIGRTN 
    • For Transit Connect,
    • Measure the resistance between:
      (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-)
      FLPT Ground
    • Measure the resistance between:
      (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-) Fuel Pressure And Temperature Sensor Connector, Harness Side
      FLPT SIGRTN
    • For all others,
    • Measure the resistance between:
      (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-)
      FLP Ground
    • Measure the resistance between:
    (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-) Fuel Pressure And Temperature Sensor Connector, Harness Side
    FLP SIGRTN

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  MD5. REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  5. MD5 CHECK THE FLP CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • For Transit Connect,
    • Measure the voltage between:
      (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-)
      FLPT Ground
    • For all others,
    • Measure the voltage between:
    (+) Fuel Pressure And Temperature Sensor Connector, Harness Side (-)
    FLP Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 GO to  MD6.
  6. MD6 INDUCE A LOW VOLTAGE ON THE FLP CIRCUIT 
    • Ignition OFF.
    • PCM-E connector connected.
    • For Transit Connect,
    • Connect a 5 amp fused jumper wire between the following:
      Point A Fuel Pressure And Temperature Sensor Connector, Harness Side Point B Fuel Pressure And Temperature Sensor Connector, Harness Side
      FLPT SIGRTN
    • Ignition ON, engine OFF.
    • For all others,
    • Connect a 5 amp fused jumper wire between the following:
      Point A Fuel Pressure And Temperature Sensor Connector, Harness Side Point B Fuel Pressure And Temperature Sensor Connector, Harness Side
      FLP SIGRTN
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the FLP_V (VOLT) PID.

    Is the voltage less than 0.1 V? 

    Yes No
    INSTALL a new Fuel Pressure And Temperature sensor. REFER to the appropriate Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to PINPOINT TEST ZZ .
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